Mantis#2591. Thank you kindly, Ruud Lathrop for a patch that:

This patch is two script that fixes a issue when adding more 
then 1 avatar to estateban/estatemanager list. It removes a 
key and adds a index to the tables. 

1 files changed, 25 insertions, 0 deletions

diff --git a/OpenSim/Data/MSSQL/Resources/002_EstateStore.sql b/OpenSim/Data/MSSQL/Resources/002_EstateStore.sql
new file mode 100644
index 0000000..86c5cb6
--- /dev/null
+++ b/OpenSim/Data/MSSQL/Resources/002_EstateStore.sql
@@ -0,0 +1,25 @@
+BEGIN TRANSACTION

+

+ALTER TABLE dbo.estate_managers DROP CONSTRAINT PK_estate_managers

+

+CREATE NONCLUSTERED INDEX IX_estate_managers ON dbo.estate_managers

+        (

+        EstateID

+        ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

+

+ALTER TABLE dbo.estate_groups DROP CONSTRAINT PK_estate_groups

+

+CREATE NONCLUSTERED INDEX IX_estate_groups ON dbo.estate_groups

+        (

+        EstateID

+        ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

+

+

+ALTER TABLE dbo.estate_users DROP CONSTRAINT PK_estate_users

+

+CREATE NONCLUSTERED INDEX IX_estate_users ON dbo.estate_users

+        (

+        EstateID

+        ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

+

+COMMIT